計測と制御
Online ISSN : 1883-8170
Print ISSN : 0453-4662
ISSN-L : 0453-4662
1 巻, 4 号
選択された号の論文の8件中1~8を表示しています
  • 坂和 愛幸
    1962 年 1 巻 4 号 p. 253-260
    発行日: 1962/04/10
    公開日: 2011/05/24
    ジャーナル フリー
  • 堤 厚
    1962 年 1 巻 4 号 p. 261-269
    発行日: 1962/04/10
    公開日: 2010/10/21
    ジャーナル フリー
    Described herein is a transistorized AD/DA Converter which has both analog-to-digital and digital-to-analog conversions.
    In the analog-to-digital conversion, the instrument accepts 0-5V input voltages with the input impedance higher than 500kΩ and operates on them to produce 0-1000 digital output signal (real out-put is binary coded signal) in 130μ sec with accuracy and precision of 0.1%. The, operation is, of the voltage feedback encoding method.In the digital-to-analog conversion, 0-1000 digital input, signals, are converted into 0--5V output voltages with the equivalent accuracy to that of analog-to-digital conversion. Its output impedance is Iess than 1Ω.
    The silicon diodes are employed to gate the weighted currents in the DA conversion circuit from which feedback voltages are obtained in the analog -to-digital conversion and the output voltages in digitalto-analog conversion. As all the circuits of the instrument are carefully compensated against the temperature change, it can be used in ambient temperature 5-50°C.
  • 安濃 恒友
    1962 年 1 巻 4 号 p. 270-275
    発行日: 1962/04/10
    公開日: 2010/10/21
    ジャーナル フリー
    The author has presented the report of dielectric type (condenser type or electrostatic type) high frequency generator. Besides this generator, the rotating machine and sliding apparatus of this type are utilized as controlling or measuring elements such as deviation detector, position detector, tachogenerator and so on.
    This article is concerned with the voltage sensitivity of deviation detector of this type. Besides this type, there are many deviation detectors based on other principles. Pointed out as high sensitivity ones among them are differential transformer, Inductosyn, Vernier resolver, Telecote etc., all of electromagnetic induction type. Among these detectors, the Inductosyn type has most similar construction to that of the dielectric type. So, the voltage sensitivity of the dielectric type was compared with that of Inductosyn type. As the result of theoretical and experimental consideration, it was proved that the dielectric type has a superiority over others in voltage sensitivity.
  • 吉江 充
    1962 年 1 巻 4 号 p. 276-284
    発行日: 1962/04/10
    公開日: 2011/05/24
    ジャーナル フリー
    Some papers concerning boiler dynamics have been reported hitherto, but they are not so correct in high pressure ranges and accordingly they don't serve enough to analyze and synthesize the control systems.
    Under such circumstances, the author deduced the following fundamental equations for dynamics and thermal capacity of evaporator:
    _??_
    WhereQ=Δq/q0, θf=Δθffo, Gf=Δgf/gfo, G2=Δg2/g20, P1=Δp1/p10, q (heat transmission rate), θ1, θf (temperatures of saturated steam and feed water), g2, gf (flow rates of load steam and feed water), p1 (pressure of saturated steam), i″, i′, if (enthalpies of saturated steam, saturated water and feed water), v″, v′ (specific volumes of saturated steam and saturated water), wm, w′, w″ (weights of steel parts, water and steam contributing to thermal capacity of evaporator), b (volume of evaporator), cm (specific heat of steel), A (thermal equivalent of work), suffix 0 (values at equilibrium conditions), Δ (small changes from equilibrium conditions), Hθ (effect of change of feed water temperature), Hw (effect of change of feed water flow rate), Hs (effect of change of load steam flow rate), TB (time constant indicating thermal capacity of evaporator). TB, Hθ, Hw and Hs are given in nomographs for convenience of calculation.
    Optimum synthesis for two standard pressure control systems are discussed and a nomograph is given for optimum paprameter settings. Transient pressure changes induced by load change are also given in other nomographs.
    The value of ∂i″/∂p1 changes at p1≈30kg/cm2 abs., and it should be noticed that the control system changes its characteristics at this boundary pressure.
  • 高橋 義造, 玄地 宏, 中野 馨
    1962 年 1 巻 4 号 p. 285-292
    発行日: 1962/04/10
    公開日: 2010/10/21
    ジャーナル フリー
    This article describes the “Digitalized Analog Computer” which presents same characteristics as those of the analog computer only by digigital operation. It can be used for real time control of high accuracy.This computer, a sort of digital differential analyzer, consists of operational units each of which has registers to run parallel operation and can make high-speed computation. A model computer DAC-I made for trial consists of five integrators and other sorts of five operational elements. In this computer, the clock frequency is 100 kcps and one word is composed of 20 bits. A circle test shows that it can generate stabilized sinusoidal waves of 50 cps. As integration is done not only with time but with variables voluntarily selected in each of integrators, considerably complex problems can be solved with a small number of operation' units. Several examples of computation are given, too.
  • 伊沢 計介
    1962 年 1 巻 4 号 p. 293-299
    発行日: 1962/04/10
    公開日: 2010/10/21
    ジャーナル フリー
    On-off control action coupled with a sampling and holding mechanism is equivalent to the on-off control action with a stochastically varying dead time. The magnitude of the dead time may take a value between 0 and the interval of the sampling action. Limit band can easily be constructed on the phase plane, encolosing all possible limit cycles and ultimate trajectories. The inner boundary of the limit band is reduced in size by decreasing a fixed dead time along the control loop, while the outer boundary of the limit band is reduced by decreasing the sum on the fixed dead time and the sampling interval. The size of the limit band can also be reduced by introducing a predicting compensater along the control loop. Only for particular initial conditions there exist limit cycles or exactly perioic oscillations of the system output inside the limit band, but almost all trajectories are not periodic and are fluctuating in the limit band.
    The result of the tests by using analog computer shows good coincidence with that of the theoretical investigations and also shows that the limit band may provide sufficient information for the design of this type of control systems. The characteristics of the limit band can be predicted by the system paramesers.
  • 森永 智昭
    1962 年 1 巻 4 号 p. 300-308
    発行日: 1962/04/10
    公開日: 2010/10/21
    ジャーナル フリー
    Frequency response tests of two bubble-cap distillation columns are made on methanol-Waater mixture for changes of reflux flow and vapor flow. Sinusoidal response of liquid temperature of each tray is measured by thermocouple and the temperature response is translated into composition response. The frequency response date obtained in this way are compared with the solutions of material balance equations, which are derived under several assumptions and in consideration of the time lag of liquid flow between trays and the transportation lag of reflux pipe line. The experimental data are in fairly good coincidence with the calculated values in the case of reflux flow change. The result reveals that the large phase lag in high frequency range is mainly due to the time lag of liquid flow between trays. The response in low frequency range is well approximated by the first order lag with a time constant common to each tray. Its calculating method is shown in this paper.
  • 中川 晨作
    1962 年 1 巻 4 号 p. 309-311
    発行日: 1962/04/10
    公開日: 2010/10/21
    ジャーナル フリー
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